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A Wimbledon line judge describes how technology has transformed the way he does his job and why there is still a need in tennis for a human being to make crucial calls. David Bayliss, a line referee for 18 years at Wimbledon, tells Paddy O'Connell of the 'pressure to make accurate calls', and how he handles being overruled by the Hawkeye ball-tracking system. (IMAGE A Wimbledon line judge looks on at Roger Federer, Credit: Getty Images)